Thunder (real name: Park Sang Hyun) was born on October 7, 1990, in Busan, South Korea. When he was around 4 years old, his family moved to the Philippines. He studied at the Philippine Pasay Chung Hua Academy (PPCHA), where he learned to speak Filipino and English. His family eventually went back to Korea around 2007. He originally wanted to become a professional soccer player, training to become a midfielder for a few months, until he decided to pursue becoming a singer instead. He auditioned for JYP Entertainment and eventually became a trainee of LOEN Entertainment, alongside IU, before finally debuting through J. Tunes Camp as a member of boy group, MBLAQ (Music Boys Live in Absolute Quality) in 2009. His skills include rapping, dancing and singing, and has tried MCing and acting (mostly in CFs). He is also currently interested in producing music. He is best known for his eldest sister, Sandara Park (also known as Dara of 2NE1), but has since been known for his good looks, 4D personality, voice imitations and fashion style.